From the Super Mario Wiki
Shy Stacks are the third part of the Shy Guy Army in Paper Mario. They consist of four Shy Guys standing on top of each other. The Spin Smash Badge or Kooper can be used to knock them off.
They also appear in Yoshi's Island DS, along with Pirate Stacks. If a Yoshi licks one of the Shy Guys in the stack, they will fall down and become regular Shy Guys.
Stats and Tattle Information
- Max HP: 10
- Attack Power: Equal to the number of Shy Guys in the stack
- Defense: 0
- Tattle: Whoa, this pile has an incredible sense of balance! Look at that stack! Its attack power equals the number of Guys in the stack. It will be 4 if there are four Shy Guys stacked up. If you have the Spin Hammer ability, you can knock 'em off one by one. Obviously their attack power decreases when there are fewer of 'em in the stack.
- Moves: Shy Slingshot (1 per Guy)
Names in other languages